1.7 KiB
Custom Repositories
By default when locking package versions, Dune looks up packages from two sources:
- The upstream, community maintained
opam-repositoryat ocaml/opam-repository for most packages - An overlay repository with patched software to allow usage in Dune at ocaml-dune/opam-overlays
To change the presets, the dune-workspace file has to be edited (and created
if it didn't exist):
::::{dropdown} dune-workspace
:icon: file-code
:::{literalinclude} repos/dune-workspace :language: dune :::
::::
In this case, we want to select a specific revision of the community repository instead of always using the most recent one as it would do by default. We define a new repository and configure the lock directory to use this repository.
For more information about the stanzas refer to the {doc}repositories stanza </reference/dune-workspace/repository> as well as the {doc}lock_dir stanza </reference/dune-workspace/lock_dir>.
When relocking the dependencies, the list of packages that are found as dependencies changes accordingly:
$ dune pkg lock
Solution for dune.lock:
- base-unix.base
- fmt.0.9.0
- ocaml.5.0.0
- ocaml-base-compiler.5.0.0
- ocaml-config.3
- ocamlbuild.0.15.0+dune
- ocamlfind.1.9.6+dune
- topkg.1.0.
Compared to before, the OCaml compiler version is older, which shows that we did indeed pick an older version of the package repository for locking.
:::{note} This feature can also be used to make sure the locked dependencies are reproducible, as fixing all the package repository versions will lead to equivalent locking results. :::